Texas Instruments OPA547T

Overview

OPA547T from Texas Instruments is a high-voltage, high-current operational amplifier designed for precision power amplification in demanding industrial loads. It delivers ±500mA continuous output current, operates from ±4V to ±30V dual supplies (or +8V to +60V single supply), and features adjustable current limiting (0–750mA) via the ILIM pin - enabling valve drivers, servo actuators, and programmable power supplies.

For engineers reviewing the OPA547T datasheet, OPA547T pinout, OPA547T application, or OPA547T equivalent, key selection criteria include thermal shutdown indication via the E/S pin, ±2.2V output voltage swing at ±500mA load, 6V/µs slew rate, and TO-220 (KC) package with electrically isolated copper tab for heatsink mounting.

Technical Context

The OPA547T integrates laser-trimmed monolithic circuitry for low input offset voltage (±1mV typ) and high open-loop gain (100dB min), supporting accurate closed-loop control in high-power analog systems. Its internal protection includes thermal shutdown activation at +160°C junction temperature and user-configurable current limit using a 0–150µA signal into the ILIM pin.

Unlike conventional current-limiting op amps, the OPA547T senses load current indirectly - eliminating series power resistors - and provides dual-function E/S pin logic: output disable (reducing quiescent current to ±4mA) and thermal status reporting (sourcing 20µA in normal operation, sinking 5µA during shutdown).

Key Specifications

Pinout & Package

The OPA547T is housed in a 7-lead TO-220 (KC) package with straight-formed leads and an electrically isolated copper tab thermally connected to V–. The tab must be mounted to a heatsink or large PCB copper area for thermal management (θJC = 2°C/W, θJA = 65°C/W no heatsink).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current operational amplifier applications.

Compared with OPA547T, OPA548T offers higher current headroom while retaining full compatibility, whereas LM675T sacrifices programmability, monitoring, and bandwidth for lower cost - making OPA547T the optimal balance of intelligence, protection, and performance for industrial analog power stages.

Availability

OPA547T is available at Aetrix Electronics and suitable for valve drivers, servo amplifiers, and programmable power supplies requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.

Supply support for OPA547T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and power management ICs.

The OPA547T belongs to TI's high-voltage, high-current operational amplifier product line, engineered specifically for industrial actuation, precision power delivery, and ruggedized analog signal conditioning in extended-temperature environments.

FAQ

What is the maximum continuous output current of the OPA547T?

The OPA547T delivers ±500mA continuous output current under specified thermal conditions (TCASE ≤ +85°C). This rating assumes proper heatsinking - the safe operating area (SOA) curve shows reduced current capability as (V+ − VO) increases or case temperature rises above 25°C. At TCASE = 25°C, short-circuit current is limited to ±750mA by internal circuitry, but continuous operation remains ±500mA.

How does the ILIM pin adjust current limit on the OPA547T?

The ILIM pin on the OPA547T accepts a 0–150µA control current to set output current limit from 0 to ±750mA. A standard resistor between ILIM and V– implements this function: RCL = (5000 × 4.75V)/ILIM − 31.6kΩ. For example, 31.6kΩ yields ±375mA limit. Unlike shunt-based limiters, this indirect sensing avoids power loss and maintains accuracy across temperature and supply variations.

What does the E/S pin do on the OPA547T?

The E/S (Enable/Status) pin on the OPA547T serves two independent functions: pulling it below (V–) + 0.8V disables the output stage and reduces quiescent current to ±4mA; monitoring its voltage reveals thermal status - ≥2.4V indicates normal operation, ≤0.8V confirms thermal shutdown. Both functions operate simultaneously and are compatible with single- or dual-supply systems.

What package type is used for the OPA547T?

The OPA547T uses a 7-lead TO-220 package with KC lead form (straight leads), where the copper tab is electrically connected to the V– supply. This package supports direct heatsink mounting and has thermal resistance θJC = 2°C/W and θJA = 65°C/W (no heatsink). It is RoHS-compliant with Sn lead finish and rated for –40°C to +85°C operation.

Can the OPA547T operate from a single supply?

Yes, the OPA547T operates from a single supply ranging from +8V to +60V. Its input common-mode range extends below ground (to (V–) – 0.2V), allowing true ground-referenced inputs even in single-supply configurations. Output swing remains asymmetric - e.g., (V+) – 2.2V positive and (V–) + 1.6V negative at ±500mA - enabling use in unipolar power supply designs such as 0–24V programmable sources.